BUG: viz plot window's 'title' argument showed no effect.

[shristibaral]

viz plot window's 'title' argument showed no effect. Fix: if title is given, title along with subject's name will be displayed on plot window title, if title is none then subject name will be displayed as title.

Reference issue

Example: Fixes #1234.

What does this implement/fix?

Explain your changes.

Additional information

Any additional information you think is important.

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[larsoner]

Looks reasonable @shristibaral ! Can you add a doc/changes/devel/12828.bugfix.rst with something like:

Fixed behavior of :func:`mne.viz.plot_source_estimates` where the ``title`` was not displayed properly, by :newcontrib:`Shristi Baral`.

and then add your name to doc/changes/names.inc?

[shristibaral]

I have added updated docs file

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